计算(ab-a²)÷a²-2ab+b²/ab·a-b/a²的结果是?

问题描述:

计算(ab-a²)÷a²-2ab+b²/ab·a-b/a²的结果是?

(ab-a²)÷(a²-2ab+b²)/ab*(a-b)/a²=a(b-a)÷(a²-2ab+b²)/ab*(a-b)/a²=a(b-a)÷(a-b)²/ab*(a-b)/a²=a(b-a)*ab/(a-b)²*(a-b)/a²=-a(a-b)...